<?php
namespace AIOSEO\Plugin\Common\Sitemap;

/**
 * Handles outputting the sitemap.
 *
 * @since 4.0.0
 */
class Output {

	/**
	 * Outputs the sitemap.
	 *
	 * @since 4.0.0
	 *
	 * @param  array The sitemap entries.
	 * @return void
	 */
	public function output( $entries ) {
		if ( ! in_array( aioseo()->sitemap->type, [ 'general', 'rss' ], true ) ) {
			return;
		}

		// phpcs:disable VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		$charset       = get_option( 'blog_charset' );
		$advanced      = aioseo()->options->sitemap->general->advancedSettings->enable;
		$excludeImages = aioseo()->options->sitemap->general->advancedSettings->excludeImages;
		$generation    = ! isset( aioseo()->sitemap->isStatic ) || aioseo()->sitemap->isStatic ? __( 'statically', 'all-in-one-seo-pack' ) : __( 'dynamically', 'all-in-one-seo-pack' );

		echo '<?xml version="1.0" encoding="' . esc_attr( $charset ) . "\"?>\r\n";
		echo '<!-- ' . sprintf(
			// Translators: 1 - "statically" or "dynamically", 2 - The plugin name ("All in One SEO").
			esc_html__( 'This sitemap was %1$s generated by %2$s - the original SEO plugin for WordPress.', 'all-in-one-seo-pack' ),
			esc_html( $generation ),
			esc_html( AIOSEO_PLUGIN_NAME )
		) . ' -->';

		switch ( aioseo()->sitemap->indexName ) {
			case 'rss':
				if ( ! is_multisite() ) {
					$title       = get_bloginfo( 'name' );
					$description = get_bloginfo( 'blogdescription' );
					$link        = home_url();
				} else {
					$title       = get_blog_option( get_current_blog_id(), 'blogname' );
					$description = get_blog_option( get_current_blog_id(), 'blogdescription' );
					$link        = get_blog_option( get_current_blog_id(), 'siteurl' );
				}

				// Yandex doesn't support some tags so we need to check the user agent.
				$isYandexBot = false;
				if ( preg_match( '#.*Yandex.*#', $_SERVER['HTTP_USER_AGENT'] ) ) {
					$isYandexBot = true;
				}
				include_once( AIOSEO_DIR . '/app/Common/Views/sitemap/xml/rss.php' );
				break;
			case 'root':
				if ( aioseo()->options->sitemap->general->indexes ) {
					$xslUrl = home_url() . '/default.xsl';
					echo "\r\n\r\n<?xml-stylesheet type=\"text/xsl\" href=\"" . esc_attr( $xslUrl ) . "\"?>\r\n";
					include( AIOSEO_DIR . '/app/Common/Views/sitemap/xml/root.php' );
					break;
				}
				// If non-indexed, fall through to default.
			default:
				$xslUrl = home_url() . '/default.xsl';
				echo "\r\n\r\n<?xml-stylesheet type=\"text/xsl\" href=\"" . esc_attr( $xslUrl ) . "\"?>\r\n";
				include( AIOSEO_DIR . '/app/Common/Views/sitemap/xml/default.php' );
				break;
		}
	}

	/**
	 * Escapes and echoes the given XML tag value.
	 *
	 * @since 4.0.0
	 *
	 * @param  string $value The tag value.
	 * @param  string $wrap  Whether the value should we wrapped in a CDATA section.
	 * @return void
	 */
	public function escapeAndEcho( $value, $wrap = true ) {
		$safeText = wp_check_invalid_utf8( $value, true );

		if ( ! $safeText ) {
			return;
		}

		$cdataRegex = '\<\!\[CDATA\[.*?\]\]\>';
		$regex      = "/(?=.*?{$cdataRegex})(?<non_cdata_followed_by_cdata>(.*?))(?<cdata>({$cdataRegex}))|(?<non_cdata>(.*))/sx";

		$safeText = (string) preg_replace_callback(
			$regex,
			static function( $matches ) {
				if ( ! $matches[0] ) {
					return '';
				}

				if ( ! empty( $matches['non_cdata'] ) ) {
					// Escape HTML entities in the non-CDATA section.
					return _wp_specialchars( $matches['non_cdata'], ENT_XML1 );
				}

				// Return the CDATA Section unchanged, escape HTML entities in the rest.
				return _wp_specialchars( $matches['non_cdata_followed_by_cdata'], ENT_XML1 ) . $matches['cdata'];
			},
			$safeText
		);

		if ( ! $wrap || isset( $_GET['aioseo-dev'] ) ) {
			return print( $safeText ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
		}
		printf( '<![CDATA[%1$s]]>', $safeText ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
	}

	/**
	 * Returns the URL for the sitemap stylesheet.
	 *
	 * This is needed for compatibility with multilingual plugins such as WPML.
	 *
	 * @since 4.0.0
	 *
	 * @return string The URL to the sitemap stylesheet.
	 */
	private function xslUrl() {
		return esc_url( apply_filters( 'aioseo_sitemap_xsl_url', aioseo()->helpers->localizedUrl( '/sitemap.xsl' ) ) );
	}
}